bpf: Change bpf_getsockopt(SOL_IPV6) to reuse do_ipv6_getsockopt()
This patch changes bpf_getsockopt(SOL_IPV6) to reuse do_ipv6_getsockopt(). It removes the duplicated code from bpf_getsockopt(SOL_IPV6). This also makes bpf_getsockopt(SOL_IPV6) supporting the same set of optnames as in bpf_setsockopt(SOL_IPV6). In particular, this adds IPV6_AUTOFLOWLABEL support to bpf_getsockopt(SOL_IPV6). ipv6 could be compiled as a module. Like how other code solved it with stubs in ipv6_stubs.h, this patch adds the do_ipv6_getsockopt to the ipv6_bpf_stub. Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Link: https://lore.kernel.org/r/20220902002931.2896218-1-kafai@fb.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Родитель
fd969f25fe
Коммит
38566ec06f
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@ -1160,6 +1160,8 @@ int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval
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unsigned int optlen);
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int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
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unsigned int optlen);
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int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
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sockptr_t optval, sockptr_t optlen);
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int ipv6_getsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int __user *optlen);
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@ -83,6 +83,8 @@ struct ipv6_bpf_stub {
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struct sk_buff *skb);
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int (*ipv6_setsockopt)(struct sock *sk, int level, int optname,
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sockptr_t optval, unsigned int optlen);
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int (*ipv6_getsockopt)(struct sock *sk, int level, int optname,
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sockptr_t optval, sockptr_t optlen);
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};
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extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
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@ -5191,8 +5191,9 @@ static int sol_ip_sockopt(struct sock *sk, int optname,
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KERNEL_SOCKPTR(optval), *optlen);
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}
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static int sol_ipv6_setsockopt(struct sock *sk, int optname,
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char *optval, int optlen)
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static int sol_ipv6_sockopt(struct sock *sk, int optname,
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char *optval, int *optlen,
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bool getopt)
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{
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if (sk->sk_family != AF_INET6)
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return -EINVAL;
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@ -5200,15 +5201,20 @@ static int sol_ipv6_setsockopt(struct sock *sk, int optname,
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switch (optname) {
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case IPV6_TCLASS:
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case IPV6_AUTOFLOWLABEL:
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if (optlen != sizeof(int))
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if (*optlen != sizeof(int))
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return -EINVAL;
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break;
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default:
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return -EINVAL;
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}
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if (getopt)
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return ipv6_bpf_stub->ipv6_getsockopt(sk, SOL_IPV6, optname,
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KERNEL_SOCKPTR(optval),
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KERNEL_SOCKPTR(optlen));
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return ipv6_bpf_stub->ipv6_setsockopt(sk, SOL_IPV6, optname,
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KERNEL_SOCKPTR(optval), optlen);
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KERNEL_SOCKPTR(optval), *optlen);
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}
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static int __bpf_setsockopt(struct sock *sk, int level, int optname,
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@ -5222,7 +5228,7 @@ static int __bpf_setsockopt(struct sock *sk, int level, int optname,
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else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP)
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return sol_ip_sockopt(sk, optname, optval, &optlen, false);
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else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6)
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return sol_ipv6_setsockopt(sk, optname, optval, optlen);
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return sol_ipv6_sockopt(sk, optname, optval, &optlen, false);
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else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP)
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return sol_tcp_sockopt(sk, optname, optval, &optlen, false);
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@ -5240,43 +5246,30 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname,
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static int __bpf_getsockopt(struct sock *sk, int level, int optname,
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char *optval, int optlen)
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{
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int err = 0, saved_optlen = optlen;
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int err, saved_optlen = optlen;
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if (!sk_fullsock(sk))
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goto err_clear;
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if (level == SOL_SOCKET) {
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err = sol_socket_sockopt(sk, optname, optval, &optlen, true);
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} else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) {
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err = sol_tcp_sockopt(sk, optname, optval, &optlen, true);
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} else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) {
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err = sol_ip_sockopt(sk, optname, optval, &optlen, true);
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} else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) {
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struct ipv6_pinfo *np = inet6_sk(sk);
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if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
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goto err_clear;
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/* Only some options are supported */
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switch (optname) {
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case IPV6_TCLASS:
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*((int *)optval) = (int)np->tclass;
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break;
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default:
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goto err_clear;
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}
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} else {
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goto err_clear;
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if (!sk_fullsock(sk)) {
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err = -EINVAL;
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goto done;
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}
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if (level == SOL_SOCKET)
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err = sol_socket_sockopt(sk, optname, optval, &optlen, true);
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else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP)
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err = sol_tcp_sockopt(sk, optname, optval, &optlen, true);
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else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP)
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err = sol_ip_sockopt(sk, optname, optval, &optlen, true);
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else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6)
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err = sol_ipv6_sockopt(sk, optname, optval, &optlen, true);
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else
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err = -EINVAL;
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done:
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if (err)
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optlen = 0;
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if (optlen < saved_optlen)
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memset(optval + optlen, 0, saved_optlen - optlen);
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return err;
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err_clear:
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memset(optval, 0, optlen);
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return -EINVAL;
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}
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static int _bpf_getsockopt(struct sock *sk, int level, int optname,
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@ -1058,6 +1058,7 @@ static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
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.inet6_bind = __inet6_bind,
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.udp6_lib_lookup = __udp6_lib_lookup,
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.ipv6_setsockopt = do_ipv6_setsockopt,
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.ipv6_getsockopt = do_ipv6_getsockopt,
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};
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static int __init inet6_init(void)
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@ -1131,8 +1131,8 @@ static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
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return 0;
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}
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static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
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sockptr_t optval, sockptr_t optlen)
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int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
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sockptr_t optval, sockptr_t optlen)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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int len;
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